26561057796 has 216 divisors, whose sum is σ = 86825566464. Its totient is φ = 6778961280.

The previous prime is 26561057779. The next prime is 26561057807. The reversal of 26561057796 is 69775016562.

26561057796 is a `hidden beast` number, since 2 + 6 + 5 + 61 + 0 + 577 + 9 + 6 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 692211 + ... + 729573.

Almost surely, 2^26561057796 is an apocalyptic number.

26561057796 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26561057796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43412783232).

26561057796 is an abundant number, since it is smaller than the sum of its proper divisors (60264508668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26561057796 is a wasteful number, since it uses less digits than its factorization.

26561057796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37431 (or 37419 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 54.

The spelling of 26561057796 in words is "twenty-six billion, five hundred sixty-one million, fifty-seven thousand, seven hundred ninety-six".